Self-supporting nanopore membranes with controlled pore size and shape
Self-supporting nanopore membranes with controlled pore size and shape
复制标题
DOI：
10.1021/nn8000017
复制
发表时间：
2008-05-01
期刊：
影响因子：
17.1
通讯作者：
Collinson, Maryanne M.
中科院分区：
文献类型：
--
作者：
Lu, Zhe-Xue;Namboodiri, Arya;Collinson, Maryanne M.
通过结合溶胶-凝胶处理、薄膜制备和模板，使用非光刻方法制备了包含孤立或有序纳米孔阵列的自支撑膜。具体地，将聚苯乙烯胶乳球掺杂到由四乙氧基硅烷和二甲基二乙氧基硅烷制备的混合溶胶中，并将所得溶胶旋涂在牺牲载体上。在除去模板和牺牲载体后，将自支撑纳米孔膜转移到玻璃上，用于通过原子力显微镜和扫描电子显微镜进行表征。通过改变膜的厚度和聚苯乙烯胶乳球的尺寸，改变纳米孔的几何形状（圆柱状到不对称状）和尺寸。已经使用直径范围为100至3100 nm的模板制备了直径范围为35至2100 nm、纵横比（定义为顶部孔径除以底部孔径）为1-4和深度（有效膜厚度）为50至1500 nm的孔。所描述的方法采用“湿化学”，是高度通用的，并且易于通过利用不同尺寸和几何形状的模板进行修饰，以产生具有不同孔几何形状和尺寸的稳定膜，其可用作纳滤和/或化学传感器的平台。
Self-supporting membranes containing either isolated or organized arrays of nanosized pores have been prepared using a nonlithographic approach by coupling sol-gel processing, thin film preparation, and templating. Specifically, polystyrene latex spheres were doped into a hybrid sol prepared from tetraethoxysilane and dimethyldiethoxysilane and the resultant sol spin cast on a sacrificial support. Upon removal of the template and the sacrificial support, the self-supporting nanopore membranes were transferred to glass for characterization by atomic force microscopy and scanning electron microscopy. Through variations in the thickness of the membranes and the size of the polystyrene latex spheres, the geometry (cylinder-like to asymmetric-like) and the dimensions of the nanopores were altered. Pores with diameters that range from 35 to 2100 nm, aspect ratios (defined as the top pore diameter divided by the bottom pore diameter) from 1-4, and depths (effective film thickness) from 50 to 1500 nms have been prepared using templates that range in diameter from 100 to 3100 nm. The method described employs "wet-chemistry", is highly versatile, and is easily amenable to modification by utilizing templates of different sizes and geometries to create stable membranes with different pore geometries and sizes that can be used as platforms for nanofiltration and/or chemical sensors.